There's an Pistol Ammo inside the shack.

Answer the phone
easy - another Pistol Ammo is behind the sofa
Go left

There's Pistol Ammo on the right.
Go through the door by the fireplace

Pick up the [Library key] by the typewriter
Turn around and kill your first zombie.
You don't have to kill all the zombies, but be sure to search those you kill. They'll yield random items.
Go back to [Dinning room]

There are two zombies there now. Best to run past them.

There's a cat there now. It's color will be random.
With [Library key] you can now open the door to your right.

There's [Ammo Box] on your left.
There are 4 [zombies] in this room. Shoot those you see, then lure out the others.
Pick up [Herb] (aka Potten Plant) in the far right corner of the room.
easy - there will be also [Pistol Ammo] there
Go to the [Blue Hall]

Go to the room on your left.

There's a [zombie] there waiting for you.
After you kill it, pick up the [Ammo Box]

There's another [zombie] there
After you kill it, pick up [Bobby Pin] from the sink.
Go back to [Blue Hall]

Beware, once you move down the hall, a [chicken] will jump out of the window. It takes about 7 shots to kill it.
There's a [zombie] behind the bar and a [crumpled note] on the counter.
Go left. Hank will call you. Now open the door to the far right with [Bobby Pin]

There's a zombie and a kitty here. Go left.

One zombie.
Pick up [Film] from the bath.
Return to [Blue Hall]. Open the door closest to the bar now.

There's one zombie and some [Pistol Ammo]
Interract with the basin to reveal the code on the film.
Go back to [Book storage] room.

Open the door to your right now.

Another zombie is hiding by the door.

Go to the far right and open the door.

There is [Rifle Ammo] by the safe and [Hunting Rifle] inside.
Go back to [Canvas room] and open the door to your left.

There are 3 zombies here.
Pick [Tuna Can] from the left and [Can Opener] from the right.
Interact with the table.
Interact with the food lift. You'll get an [Sinister Eye of Foreboding].
Also, Kitty will appear.
Open the door. You're back in [Dinning room]. Make your way to [Reception]

First boss battle. This guy is though. You need about 50 pistol bullets to finish him. After about 40 he'll become enraged.
There are two [Pistol Ammo] boxes and one [Herb] here. After beating him, interact with the table.
Kitty will appear.
Use the elevator.

There are 4 wasps there.
Pick up [Pistol Ammo] behind pesticide. Open rusty door to your left.
After a scene you'll be back in the [Gallery].
Push the bookcase by interracting with it. Enter [Dark Room]

There's [Pistol Ammo] on the shelf. Navigate your way to the far left.
Kitty is sleeping on the bed.
There's [Quick Gun Mod] in the sink. It will mostly make your gun stronger.
5 zombies will appear. Deal with them, then head back to [Gallery]

There's a locked door with "Doctor Fella Study" on it. Interact with air vent on the opposite wall.

Double doors are locked. Run to the door at the far end. Hide under the bed. Once nurse passes you, open the door.

Stick to the right, then run towards the door to get past the nurse.

Interract with the kitty until it runs toward the nurse.
Hide under the table until nurse passes you.
Run towards the door.

Run to the right without touching the bottles. Open the door.

This one is a bit tricky. Run, and stick to the left as much as you can.
After the scene, head back to [Operation Room] again, and then past it, to [Hospital Corridor 2]

There are two nurses. Pick [Pistol Ammo] by the chair.
Open the door to your left, moving to [Hospital Corridor 1].

Pick [Skeleton Key]
Backtrack to [Gallery] and open "Doctor Fella Study"

Open the latched door.

There's a nurse there.
Pick up the [Herb]
Head downstairs. Pick up [Pistol Ammo]. Unlatch the door.

You'll appear behind the bar. A 80 seconds timer will kick in.
There will be a lot of zombies everywhere. Your safest route is through the kitchen.
Take rightmost door, then left, then left again, and you'll be in the [Kitchen] area. Run past the zombies, and you'll arrive at [Dinning Hall]. From here, take right, and you'll be back to [Reception] again.

The timer will stop. Head out of the door. Congratulations! You just finished the game.